Comics.

Though we have some awesome American comics (lookin at you Scott Pilgrim) Japanese comics have more variety most of the time and can be pretty interesting! Once you learn how to read them correctly of course.

I like American comics better just because of the diverse amount of topics other than the superhero genre. A lot of comics are based on animated television shows, which I fancy.

I personally lean more towards American comics, but I'm mostly a Superhero fan. Even if it's not explicitly stated, I just like more action-oriented stories. It's why I did like series like Dragonball/DBZ and Shaman King, but also why my favorite series usually involve Superman.

American comics not always about super powered being actually, they have some good titles too outside Superhero genre...

I'm not a comics person, but I will state my opinion regardless.

American generally has a larger range of targeted demographics. It's also, how can I put this?....Most stuff out of Japan is pretty perverted.

Japanese, however, has a much better looking artistic style than what we Americans can come up with. Anime/manga also usually has a wide variety of thematic content. It can be serious one moment, then gut-bustingly hilarious the next.

American comics, because of Image. They have some extremely awesome series!

Manga because anime iron man. Also they actually show expression, emotion, and movement which American comics are god damn terrible at.

American and English non-superhero comics. I've never seen a manga as intellectually challenging as, say, Transmetropolitain or as stylized as Hellboy or Sandman. 

European comics is the answer

Honestly, (to me at least) it's whether or not it looks good.

First of all American comics are more than superhero comics, like the series Amulet, Smile, and Scott Pilgram. Both comic genres have a lot of cringy moments (too much expression, too little expression, anatomy destruction, saggy stories, etc.) However a lot of very cool styles or summaries that can draw the reader in with whatever interest readers are into these days. There are also many American and Japanese comics that are online too, and a lot don't deal with sappy love stories or superhero comics. So in the end I would say both, it's just you have to find the gems that are worthwhile to read and enjoy. ^w^

American comics seem pretty limited to superheroes (with some exceptions), so I tend to lean towards manga. 

That said, at least two of my favorite comic series are American made-- "Maus" and "The Crow." And "Sin City" is very much on my to-read list, and I think that's an American one too. So I guess I just proved myself wrong. 

It's hard to generalize since both have their own highs and lows.

Japanese! ^_^

I don't really like American comics due to artstyle and the difficulty in getting into Superhero comic and stuff.

I like both, but I generally dislike superhero comics. It's mostly the art style that turns me off. There have been plenty of other non-superhero Western comics that I've enjoyed though.

I rarely read comics, they don't interest me much, the ones that do I'll leaf threw them at the store.  I prefer Japanese comic over American, mostly because I like the art style and interesting paths they can (freely) take the plot.

Well, American comics have more variety in styles. Manga, to me, seem to be mostly the same everywhere. Haven't read a lot of manga mostly because the series are so long. I gotta read something like Dragon Ball at some point...